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3.1 Water Supply System Overview

This document provides an overview of the potable water supply system at Lake Bennett Estate, consolidating the key details from the supporting sub-pages for Bore and Pump Systems, Storage Tanks, Chlorine Dosing, Reticulation, and Water Conservation.

System Status

Current Assessment

The water supply system is operational and fit for purpose when operated and maintained per this manual. Primary supply is via bore water with on-site storage, disinfection, and a reticulation network that provides distribution and isolation control across the estate.

Capacity Overview

Source Capacity

  • Bore System Output: ~100 L/min (see 3.1.1 Bore and Pump Systems)
  • Bores: Bore 1 (RN43075), Bore 2 (RN32812), plus a legacy bore (RN31076 – retained, not in use)

Storage Capacity

  • Total On-site Storage: ≈ 449,250 L (see 3.1.2 Storage Tanks)
  • Steel Tank (Rhino RT-310): ~309,250 L
  • Poly Tanks 2–5: ~120,000 L total (≈30,000 L each)
  • Poly Tanks 6–7: ~20,000 L total (≈10,000 L each)

Distribution Network

  • Primary Main: 110 mm line from hill-top tanks to central distribution box
  • Key Isolation: Central box valves segment supply to units (#40–#58, west side, #17–#39, #1–#16); additional isolation near Unit #17 and in western easement after lake crossing (see 3.1.4 Reticulation Network)

Treatment and Controls

  • Chlorination: Inline dosing triggered by a pulse output from a mechanical water meter; delivered by a Prominent Beta 4 dosing pump to the injection point downstream of the meter (see 3.1.3 Chlorine Dosing System)
  • Control Hub: Green shed with wire-mesh doors housing the Kelco F60 digital pump controller, bladder pressure tank, mechanical and ultrasonic flow meters, alarms, and mode switches (see 3.1.1)
  • Over-pressure Protection: Automatic relief valve installed upstream of the chlorination point

Water Quality and Monitoring

  • Standards: Complies with Australian Drinking Water Guidelines (NHMRC 2011) and NT Health reporting
  • Key Targets: pH 6.5–8.5; Turbidity < 4 NTU; Chlorine residual 0.2–5.0 mg/L (if chlorinated); Microbiological: 0 E. coli/100 mL
  • Testing Cadence: Daily spot checks (pH/turbidity/chlorine where applicable); Weekly aesthetic checks; Monthly microbiological; Quarterly chemical (incl. metals); Annual comprehensive review
  • Sampling: Conduct per documented procedures (see Collecting Water Samples); utilise chain-of-custody and QA documentation

System Components

Detailed specifications are provided on the following sub-pages:

Primary Supply and Controls

Storage and Distribution

Treatment

Demand Management

Operations and Maintenance

Routine Tasks

  • Inspect pumps, manifolds, and isolation valves
  • Verify F60 controller modes/alarms; confirm flow meters operational
  • Test water quality per schedule and report to NT Health
  • Exercise isolation valves and flush lines as scheduled (incl. bore flush valve)

Responsibilities

  • Estate Management: Operate system, coordinate maintenance, monitor quality, respond to incidents
  • Property Owners: Maintain individual tanks/fixtures, comply with usage and conservation guidelines, report leaks

Risks and Improvements

  • Maintain bunding and ventilation in chlorination area; verify low-level cut-out functionality
  • Periodically verify over-pressure protection and dosing integrity (bleed/prime as needed)
  • Expand smart metering/leak detection and enhance record-keeping for preventative maintenance

Reference Documentation

Version Control

Version Date Description
1.0 2025-10-06 Initial Release

Next Review Date: 2026-04-06